Allah's Messenger (ﷺ) said, "A Muslim eats in one intestine (i.e. he is satisfied with a little food) while a Kafir (unbeliever) eats in seven intestines (eats much).
Sahih al-Bukhari Book 70, Hadith 24
← Previous Hadith Abu Nahik was avaricious eater. Ibn `Umar said to him, "Allah's Messenger (ﷺ) said, "A Kafir (unbeliever) eats in seven intestines (eats much)." On that Abu Nahik said, "But I believe in Allah and His Apostle ."

Sahih al-Bukhari Book 70, Hadith 23 Next Hadith → A man used to eat much, but when he embraced Islam, he started eating less. That was mentioned to the Prophet (ﷺ) who then said, "A believer eats in one intestine (is satisfied with a little food) and a Kafir eats in seven intestines (eats much). "

Sahih al-Bukhari Book 70, Hadith 25